From acf1c205bf13f3546ca26c1e89d8d5803860e72a Mon Sep 17 00:00:00 2001
From: Tim van Dijen <tvdijen@gmail.com>
Date: Fri, 6 Dec 2024 00:14:30 +0100
Subject: [PATCH] Add xenc11:IterationCount element

---
 src/XML/xenc11/IterationCount.php             | 73 +++++++++++++++++++
 tests/XML/xenc11/IterationCountTest.php       | 51 +++++++++++++
 tests/resources/xml/xenc11_IterationCount.xml |  1 +
 3 files changed, 125 insertions(+)
 create mode 100644 src/XML/xenc11/IterationCount.php
 create mode 100644 tests/XML/xenc11/IterationCountTest.php
 create mode 100644 tests/resources/xml/xenc11_IterationCount.xml

diff --git a/src/XML/xenc11/IterationCount.php b/src/XML/xenc11/IterationCount.php
new file mode 100644
index 00000000..f57fa2a3
--- /dev/null
+++ b/src/XML/xenc11/IterationCount.php
@@ -0,0 +1,73 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\XMLSecurity\XML\xenc11;
+
+use DOMElement;
+use SimpleSAML\Assert\Assert;
+use SimpleSAML\XML\Exception\InvalidDOMElementException;
+use SimpleSAML\XML\Exception\SchemaViolationException;
+
+use function intval;
+use function strval;
+
+/**
+ * Class representing a xenc11:IterationCount element.
+ *
+ * @package simplesamlphp/xml-security
+ */
+final class IterationCount extends AbstractXenc11Element
+{
+    /**
+     * @param int $iterationCount
+     */
+    public function __construct(
+        protected int $iterationCount,
+    ) {
+        Assert::positiveInteger($iterationCount, SchemaViolationException::class);
+    }
+
+
+    /**
+     * @return int
+     */
+    public function getIterationCount(): int
+    {
+        return $this->iterationCount;
+    }
+
+
+    /**
+     * Convert XML into a class instance
+     *
+     * @param \DOMElement $xml The XML element we should load
+     * @return static
+     *
+     * @throws \SimpleSAML\XML\Exception\InvalidDOMElementException
+     *   If the qualified name of the supplied element is wrong
+     */
+    public static function fromXML(DOMElement $xml): static
+    {
+        Assert::same($xml->localName, static::getLocalName(), InvalidDOMElementException::class);
+        Assert::same($xml->namespaceURI, static::NS, InvalidDOMElementException::class);
+        Assert::numeric($xml->textContent);
+
+        return new static(intval($xml->textContent));
+    }
+
+
+    /**
+     * Convert this element to XML.
+     *
+     * @param \DOMElement|null $parent The element we should append this element to.
+     * @return \DOMElement
+     */
+    public function toXML(?DOMElement $parent = null): DOMElement
+    {
+        $e = $this->instantiateParentElement($parent);
+        $e->textContent = strval($this->getIterationCount());
+
+        return $e;
+    }
+}
diff --git a/tests/XML/xenc11/IterationCountTest.php b/tests/XML/xenc11/IterationCountTest.php
new file mode 100644
index 00000000..2138b88f
--- /dev/null
+++ b/tests/XML/xenc11/IterationCountTest.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\XMLSecurity\Test\XML\xenc11;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\TestCase;
+use SimpleSAML\XML\DOMDocumentFactory;
+use SimpleSAML\XML\TestUtils\SerializableElementTestTrait;
+use SimpleSAML\XMLSecurity\XML\xenc11\AbstractXenc11Element;
+use SimpleSAML\XMLSecurity\XML\xenc11\IterationCount;
+
+use function dirname;
+use function strval;
+
+/**
+ * Class \SimpleSAML\XMLSecurity\XML\Test\xenc11\IterationCountTest
+ *
+ * @package simplesamlphp/xml-security
+ */
+#[CoversClass(AbstractXenc11Element::class)]
+#[CoversClass(IterationCount::class)]
+final class IterationCountTest extends TestCase
+{
+    use SerializableElementTestTrait;
+
+    /**
+     */
+    public static function setUpBeforeClass(): void
+    {
+        self::$testedClass = IterationCount::class;
+
+        self::$xmlRepresentation = DOMDocumentFactory::fromFile(
+            dirname(__FILE__, 3) . '/resources/xml/xenc11_IterationCount.xml',
+        );
+    }
+
+
+    /**
+     */
+    public function testMarshalling(): void
+    {
+        $iterationCount = new IterationCount(3);
+
+        $this->assertEquals(
+            self::$xmlRepresentation->saveXML(self::$xmlRepresentation->documentElement),
+            strval($iterationCount),
+        );
+    }
+}
diff --git a/tests/resources/xml/xenc11_IterationCount.xml b/tests/resources/xml/xenc11_IterationCount.xml
new file mode 100644
index 00000000..55139a18
--- /dev/null
+++ b/tests/resources/xml/xenc11_IterationCount.xml
@@ -0,0 +1 @@
+<xenc11:IterationCount xmlns:xenc11="http://www.w3.org/2009/xmlenc11#">3</xenc11:IterationCount>